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gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag

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BugLink: https://bugs.launchpad.net/bugs/2109640

commit 7c9d9223802fbed4dee1ae301661bf346964c9d2 upstream.

Truncate an inode's address space when flipping the GFS2_DIF_JDATA flag:
depending on that flag, the pages in the address space will either use
buffer heads or iomap_folio_state structs, and we cannot mix the two.

Reported-by: Kun Hu <huk23@m.fudan.edu.cn>, Jiaji Qin <jjtan24@m.fudan.edu.cn>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CVE-2025-21699
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Andreas Gruenbacher
2025-01-13 19:31:28 +01:00
committed by Stefan Bader
parent a84f266655
commit 87d49ed5ba
1 changed files with 1 additions and 0 deletions
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fs/gfs2/file.c
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@@ -251,6 +251,7 @@ static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask)
error = filemap_fdatawait(inode->i_mapping);
if (error)
goto out;
truncate_inode_pages(inode->i_mapping, 0);
if (new_flags & GFS2_DIF_JDATA)
gfs2_ordered_del_inode(ip);
}